echo '<p class="hint">'.__('This localized version contains both the translation and various other localization fixes. You can skip upgrading if you want to keep your current translation.').'</p>';

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else if ( 'en_US' == $update->locale && get_locale() != 'en_US' ) {

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echo '<p class="hint">'.sprintf( __('You are about to install WordPress %s <strong>in English.</strong> There is a chance this upgrade will break your translation. You may prefer to wait for the localized version to be released.'), $update->current ).'</p>';